diff --git a/test/auto/test_auto.py b/test/auto/test_auto.py
index 7b485f9..7e8da5e 100644
--- a/test/auto/test_auto.py
+++ b/test/auto/test_auto.py
@@ -5,18 +5,18 @@ import pytest
 import warnings
 from copy import copy
 from py.test import raises
+from collections import OrderedDict
 from .autopath import do_autopath
 do_autopath()
 from tiramisu import Config, MetaConfig, \
                      StrOption, SymLinkOption, OptionDescription, MasterSlaves, DynOptionDescription, \
                      submulti, undefined, owners, Params, ParamOption
 from tiramisu.error import PropertiesOptionError, APIError, ConfigError, SlaveError
-from collections import OrderedDict
 ICON = u'\u2937'
 
 OPTIONS_TYPE = {'str': {'type': str,
                         'option': StrOption}
-               }
+                }
 PROPERTIES = ['hidden', 'disabled', 'mandatory']
 PROPERTIES_LIST = ['prop1', 'prop2']
 
@@ -145,8 +145,7 @@ def _set_value(cfg, pathwrite, conf, **kwargs):
                     cfg.config(conf).forcepermissive.option(pathwrite).value.set([first_value[0]])
             else:
                 raises(PropertiesOptionError, "cfg.config(conf).option(pathwrite).value.set([first_value[0]])")
-                raises(PropertiesOptionError,
-                       "cfg.config(conf).forcepermissive.option(pathwrite).value.set([first_value[0]])")
+                raises(PropertiesOptionError, "cfg.config(conf).forcepermissive.option(pathwrite).value.set([first_value[0]])")
             if len(first_value) > 1:
                 raises(APIError, "cfg.config(conf).unrestraint.option(pathwrite).value.set(first_value[1])")
         elif isslave:
@@ -161,10 +160,8 @@ def _set_value(cfg, pathwrite, conf, **kwargs):
                     cfg.config(conf).forcepermissive.option(pathwrite, 1).value.set(second_value)
             else:
                 raises(PropertiesOptionError, "cfg.config(conf).option(pathwrite, 1).value.set(second_value)")
-                raises(PropertiesOptionError,
-                       "cfg.config(conf).forcepermissive.option(pathwrite, 1).value.set(second_value)")
-            raises(APIError,
-                   "cfg.config(conf).unrestraint.option(pathwrite).value.set([second_value, second_value])")
+                raises(PropertiesOptionError, "cfg.config(conf).forcepermissive.option(pathwrite, 1).value.set(second_value)")
+            raises(APIError, "cfg.config(conf).unrestraint.option(pathwrite).value.set([second_value, second_value])")
 
         else:
             if not kwargs.get('permissive', False) and not kwargs.get('propertyerror', False):
@@ -1751,7 +1748,6 @@ def test_options(paths):
 #                                continue
 #                            for default in (True,):
 #                                for multi in (submulti,):
-                                    meta, callback, consistency, require, default_multi, symlink, default, multi = (True, False, True, False, True, True, True, True)
                                     if multi is submulti and default:
                                         continue
                                     if multi is submulti and consistency:
diff --git a/tiramisu/api.py b/tiramisu/api.py
index c1ac7a0..2aebdbe 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -524,14 +524,9 @@ class TiramisuOptionValue(CommonTiramisuOption):
                 subconfig,
                 option_bag):
         if subconfig is not None:
-            cls._name = name
-            cls._subconfig = subconfig
-            cls._option_bag = option_bag
-            cls._get_option(cls)
-            option = option_bag.option
-            del cls._name
-            del cls._subconfig
-            del cls._option_bag
+            option = subconfig.cfgimpl_get_description().impl_getchild(name,
+                                                                       option_bag.config_bag,
+                                                                       subconfig.cfgimpl_get_path())
         else:
             option = None
         types = [CommonTiramisuOption]
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index 94f6db7..65c448e 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -326,7 +326,7 @@ class Undefined(object):
 undefined = Undefined()
 
 
-#____________________________________________________________
+# ____________________________________________________________
 class Settings(object):
     "``config.Config()``'s configuration options settings"
     __slots__ = ('_p_',
@@ -349,7 +349,7 @@ class Settings(object):
         self._p_ = properties
         self._pp_ = permissives
 
-    #____________________________________________________________
+    # ____________________________________________________________
     # get properties and permissive methods
 
     def get_context_properties(self):
@@ -693,7 +693,9 @@ class Settings(object):
                                option_properties,
                                config_properties,
                                config_permissives):
-        properties = option_properties & config_properties - {'frozen', 'mandatory', 'empty'}
+        properties = option_properties & config_properties - {'frozen',
+                                                              'mandatory',
+                                                              'empty'}
         # remove global permissive properties
         if properties and ('permissive' in config_properties):
             properties -= config_permissives
@@ -713,8 +715,8 @@ class Settings(object):
         if not config_bag.properties:
             return
         properties = self.calc_raises_properties(option_bag.properties,
-                                                 option_bag.config_bag.properties,
-                                                 option_bag.config_bag.permissives)
+                                                 config_bag.properties,
+                                                 config_bag.permissives)
         if properties != frozenset():
             raise PropertiesOptionError(option_bag,
                                         properties,